What’s another way to keep my golf glove stretched without buying a golf glove keeper?

don’t crumple it when storing it. I would take it off my fingers one by one, and then air it a little before putting it in the golf bag.

I was told by my golf pro to keep my glove in a Ziploc bag after use. The bag protects the glove from moisture and the outside elements. It also keeps the leather supple.